Bidirectional bearing flexible plane moving bearing and centrifugal machine vibration table

Abstract

The utility model discloses a bidirectional bearing flexible plane moving bearing which comprises a loading shaft, a bearing end cover, balls, a retainer, a spherical hinge inner ring, a spherical hinge outer ring, a gasket and a locking nut, the ball is restrained between the bearing end cover and the spherical hinge inner ring through the retainer; the bearing end cover, the spherical hinge inner ring, the retainer, the spherical hinge outer ring and the gasket are connected together through the loading shaft and are integrally pre-tightened through the locking nut. Motion decoupling of the vibration table of the centrifugal machine can be achieved, vibration can be effectively transmitted in the axial direction, follow-up can be conducted in the radial direction, and good guidance quality and certain flexibility are achieved; the centrifugal machine vibration table adopting the bidirectional bearing flexible plane moving bearing is simple in composition and compact in structure, and can solve the oil leakage problem of a hydrostatic pressure bearing and the problems of energy consumption and control nonlinearity caused by a laminated rubber bearing.

Description

Technical Field

[0001] The utility model belongs to the technical field of vibration test equipment, and in particular relates to a bidirectionally loaded compliant plane moving bearing and a centrifuge vibration table. Background Art

[0002] The centrifuge vibration table is currently the most effective and advanced scientific testing platform for studying geotechnical earthquake engineering and soil dynamics. It has time-reduction and scale-reduction effects. For example, when conducting a 1-meter-deep soil model test on a centrifuge vibration table, when the centrifugal acceleration reaches 100g, the bottom of the soil model can reproduce the deadweight stress level at a depth of 100 meters in situ. Furthermore, by applying seismic waves or other excitations to the bottom of the model using a centrifuge vibration table, the dynamic characteristics and destructive behavior of the structural prototype under real seismic waves or other excitations can be reproduced, which is of great value for predicting the seismic safety of engineering projects. As research continues, the demand for centrifuge vibration tables is also increasing. In terms of vibration direction, the traditional unidirectional vibration table has evolved into a bidirectional vibration table and even a tridirectional vibration table. Among these, the most critical technology is motion-guided decoupling technology.

[0003] In this regard, relevant researchers have made many useful explorations. For example, the invention patent application with publication number CN111780938A discloses a three-axis centrifuge vibration table, which uses laminated rubber bearings for motion decoupling. However, the laminated rubber bearings have a certain amount of shear energy consumption and will cause nonlinear effects on waveform control. For another example, the invention patent application with publication number CN117109843A discloses a three-axis centrifuge vibration table, but because it uses liquid hydrostatic support, it needs to be equipped with an additional hydraulic system, which increases the complexity of the system. In addition, the liquid hydrostatic support has the risk of oil leakage in a centrifugal environment, which is difficult to overcome.

[0004] Therefore, there is an urgent need to develop a centrifuge vibration table motion decoupling device and a corresponding centrifuge vibration table to solve the above problems. Summary of the Invention

[0005] The purpose of the utility model is to provide a two-way load-bearing flexible planar moving bearing to achieve motion decoupling of the centrifuge vibration table. The bearing can effectively transmit vibration in the axial direction and can follow the movement in the radial direction. At the same time, it has a certain degree of flexibility. When the components connected at both ends of the bearing have relative torsion, the kinematic pair can perform a certain angle adaptation.

[0006] The purpose of the utility model is to provide a centrifuge vibration table, which can realize three-way or two-way vibration, has a simple composition and a compact structure, and does not have the oil leakage risk of liquid static pressure support, nor does it have the shear energy consumption and nonlinear influence on waveform control of laminated rubber support.

[0007] To achieve the above purpose, the technical solutions provided by the present invention are as follows:

[0008] A bidirectionally load-bearing compliant plane moving bearing comprises a loading shaft, a bearing end cover, balls, a retaining frame, a spherical joint inner ring, a spherical joint outer ring, a gasket and a locking nut; the balls are constrained between the bearing end cover and the spherical joint inner ring by the retaining frame; the bearing end cover, spherical joint inner ring, retaining frame, spherical joint outer ring and gasket are connected together by the loading shaft and pre-tightened by the locking nut.

[0009] Furthermore, one end of the loading shaft is designed with a connecting flange, which can be connected to the driving component; the other end is designed with a thread, which cooperates with the locking nut to achieve pre-tightening of the overall structure.

[0010] Furthermore, the bearing end cover is a circular or square structure as a whole, with a through hole in the middle for the loading shaft to pass through; a flange is provided at the edge of the bearing end cover for constraining the retaining frame.

[0011] Furthermore, a through hole is provided in the middle of the retaining frame for the loading shaft to pass through; a plurality of spherical grooves are provided on the retaining frame for installing the balls; the balls can rotate freely in the spherical grooves of the retaining frame without falling out, and the balls will protrude from the surface of the retaining frame after installation; the retaining frame and the balls are arranged together between the inner ring of the ball joint and the bearing end cover, and the balls are in contact with the plane of the inner ring of the ball joint and the plane of the bearing end cover respectively, thereby realizing relative translation between the inner ring of the ball joint and the bearing end cover.

[0012] Furthermore, both ends of the inner ring of the ball joint are planes, forming a ball and plane pair with the ball; the outer surface of the inner ring of the ball joint is a convex spherical surface, forming a spherical pair with the outer ring of the ball joint; a through hole is provided in the middle of the inner ring of the ball joint for the loading shaft to pass through, and the size of the through hole needs to reserve a certain space for the radial movement of the loading shaft.

[0013] Furthermore, the inner surface of the outer ring of the ball joint is a concave spherical surface, which cooperates with the convex spherical surface of the inner ring of the ball joint to form a spherical pair; the side of the outer ring of the ball joint is designed with a connecting flange, which can be connected to other components.

[0014] A centrifuge vibration table comprises the bidirectionally load-bearing compliant plane moving bearing, a horizontal actuator, a slide, a base, an accumulator, and a vertical actuator; the horizontal actuator comprises a cylinder and a piston rod, the cylinder is connected to the base, and the piston rod is connected to the slide via the bidirectionally load-bearing compliant plane moving bearing; the vertical actuator comprises a vertical actuator cylinder and a vertical actuator piston rod, the vertical actuator cylinder is connected to the base, and the vertical actuator piston rod is connected to the slide via the bidirectionally load-bearing compliant plane moving bearing; the accumulator is fixed to the base and supplies oil to the horizontal actuator and the vertical actuator.

[0015] The beneficial effects of the present invention are:

[0016] 1. The bidirectionally loaded compliant plane moving bearing of the utility model realizes the three-way or bidirectional motion decoupling of the vibration table. Specifically: the internal clearance of the bidirectionally loaded compliant plane moving bearing is eliminated by pre-tightening the nut, so that bidirectional tension and compression vibration can be realized in the axial direction; the ball and plane pair formed by the ball and the inner ring of the ball joint and the bearing end cover respectively realizes the relative translation between the inner ring of the ball joint and the bearing end cover, and since the rolling friction coefficient is very small, low-power radial following can be achieved.

[0017] 2. The bidirectionally loaded compliant plane moving bearing of the present invention has a certain degree of compliance. When the components connected at both ends of the bearing are relatively twisted, the bearing can perform a certain degree of angular adaptation due to the spherical pair formed by the inner ring and the outer ring of the ball joint.

[0018] 3. The centrifuge vibration table of the present invention can realize three-way or two-way vibration, and has a simple composition and compact structure. It does not have the oil leakage risk of liquid hydrostatic support, nor does it have the shear energy consumption and nonlinear effect on waveform control of laminated rubber bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a cross-sectional view of a bidirectional load-bearing compliant plane moving bearing of the utility model;

[0020] Figure 2 This is an enlarged view of position A of a bidirectionally loaded compliant plane moving bearing of the present invention;

[0021] Figure 3 This is an axonometric view of a bidirectional load-bearing compliant plane moving bearing of the utility model;

[0022] Figure 4 This is a schematic diagram of the upper structure of a centrifuge vibration table of the utility model;

[0023] Figure 5 This is a schematic diagram of the lower structure of a centrifuge vibration table of the utility model;

[0024] Figure 6 This is a schematic structural diagram of a horizontal actuator of a centrifuge vibration table and a bidirectionally loaded compliant plane moving bearing of the utility model;

[0025] Figure 7 This is a schematic structural diagram of a vertical actuator and a bidirectionally loaded compliant plane moving bearing of a centrifuge vibration table of the present invention;

[0026] Description of reference numerals:

[0027] 1. Bidirectionally loaded compliant plane moving bearing; 2. Horizontal actuator; 3. Slide; 4. Base; 5. Accumulator; 6. Vertical actuator; 11. Loading shaft; 12. Bearing end cover; 13. Ball; 14. Cage; 15. Inner ring of ball joint; 16. Outer ring of ball joint; 17. Gasket; 18. Lock nut; 21. Piston rod; 22. Cylinder; 61. Piston rod of vertical actuator; 62. Cylinder of vertical actuator. DETAILED DESCRIPTION

[0028] The specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings. The implementation cases described are only part of the embodiments of the present invention and are not intended to limit the present invention.

[0029] refer to Figures 1 to 3 A bidirectionally loaded compliant plane moving bearing comprises a loading shaft (11), a bearing end cover (12), a ball (13), a retaining frame (14), a spherical joint inner ring (15), a spherical joint outer ring (16), a gasket (17) and a locking nut (18); the ball (13) is constrained between the bearing end cover (12) and the spherical joint inner ring (15) by the retaining frame (14); the bearing end cover (12), the spherical joint inner ring (15), the retaining frame (14), the spherical joint outer ring (16) and the gasket (17) are connected together by the loading shaft (11) and pre-tightened by the locking nut (18).

[0030] In this embodiment, one end of the loading shaft (11) is designed with a connecting flange for connecting to the driving member; the other end is designed with a thread, which cooperates with the locking nut (18) to achieve pre-tightening of the entire structure.

[0031] In this embodiment, the bearing end cover (12) is a circular or square structure as a whole, with a through hole in the middle for the loading shaft (11) to pass through; a flange is provided at the edge of the bearing end cover (12) for constraining the retaining frame (14).

[0032] In this embodiment, a through hole is provided in the middle of the retaining frame (14) for the loading shaft (11) to pass through; a plurality of spherical grooves are provided on the retaining frame (14) for installing the balls (13); the balls (13) can rotate freely in the spherical grooves of the retaining frame (14) without falling out, and the balls (13) protrude from the surface of the retaining frame (14) after installation; the retaining frame (14) and the balls (13) are arranged together between the inner ring of the ball joint (15) and the bearing end cover (12), and the balls (13) are in contact with the plane of the inner ring of the ball joint (15) and the plane of the bearing end cover (12) respectively.

[0033] In this embodiment, both ends of the ball joint inner ring (15) are planes, forming a ball and plane pair with the ball (13); the outer surface of the ball joint inner ring (15) is a convex spherical surface, forming a spherical pair with the ball joint outer ring (16); a through hole is provided in the middle of the ball joint inner ring (15) for the loading shaft (11) to pass through, and the size of the through hole needs to reserve a certain space for the radial movement of the loading shaft.

[0034] In this embodiment, the inner surface of the ball joint outer ring (16) is a concave spherical surface, which cooperates with the convex spherical surface of the ball joint inner ring (15) to form a spherical pair; the side of the ball joint outer ring (16) is designed with a connecting flange for connecting with other components.

[0035] The main features of the bidirectionally load-bearing, compliant flat motion bearing of this utility model are its ability to transmit axial force, radially follow, and possess a certain degree of compliance. Therefore, the bidirectionally load-bearing, compliant flat motion bearing can be used not only in centrifuge vibration tables, but also in other equipment and usage scenarios requiring the above characteristics.

[0036] refer to Figures 4 to 7 A centrifuge vibration table comprises a bidirectionally loaded flexible plane moving bearing (1), a horizontal actuator (2), a slide (3), a base (4), an accumulator (5) and a vertical actuator (6); the horizontal actuator (2) comprises a cylinder (22) and a piston rod (21), the cylinder (22) is connected to the base (4), and the piston rod (21) is connected to the slide (3) through the bidirectionally loaded flexible plane moving bearing (1); the vertical actuator (6) comprises a vertical actuator cylinder (62) and a vertical actuator piston rod (61), the vertical actuator cylinder (62) is connected to the base (4), and the vertical actuator piston rod (61) is connected to the slide (3) through the bidirectionally loaded flexible plane moving bearing (1); the accumulator (5) is fixed on the base (4) to supply oil to the horizontal actuator (2) and the vertical actuator (6).

[0037] In this embodiment, the Z direction is the direction of centrifugal force, and the vertical actuator (6) needs to balance the centrifugal force and provide exciting force for the slide and the test model.

[0038] In this embodiment, the three-way vibration of the centrifuge vibration table can be achieved by combining the two-way load-bearing flexible plane moving bearing (1), the horizontal actuator (2) and the vertical actuator (6). In fact, the present invention can also achieve two-way and one-way vibration of the centrifuge vibration table according to different combinations of the two-way load-bearing flexible plane moving bearing, the horizontal actuator and the vertical actuator. When the centrifuge vibration table vibrates in the z direction, the exciting force provided by the vertical actuator (3) is transmitted to the slide (3) through the two-way load-bearing flexible plane moving bearing (1) connected thereto. At this time, the two-way load-bearing flexible plane moving bearing (1) connected to the horizontal actuator (2) can follow the slide (3) in the z direction. If all the horizontal actuators (2) are not excited, unidirectional z-direction vibration can be achieved. Similarly, unidirectional x-direction, unidirectional y-direction, XY bidirectional, XZ bidirectional, YZ bidirectional and XYZ three-way vibration can be achieved.

[0039] The above description is only a part of the specific implementation of the present invention and does not limit the present invention. Any changes, modifications, additions, reductions, or substitutions made without departing from the technical solution of the present invention and within the scope of the present invention shall also fall within the scope of protection of the present invention.

Claims

1. A bidirectional load-bearing compliant plane moving bearing, characterized in that: The invention comprises a loading shaft (11), a bearing end cover (12), a ball (13), a retaining frame (14), a spherical joint inner ring (15), a spherical joint outer ring (16), a gasket (17) and a locking nut (18); the ball (13) is constrained between the bearing end cover (12) and the spherical joint inner ring (15) by the retaining frame (14); the bearing end cover (12), the spherical joint inner ring (15), the retaining frame (14), the spherical joint outer ring (16) and the gasket (17) are connected together by the loading shaft (11) and are pre-tightened as a whole by the locking nut (18).

2. A bidirectional load-bearing compliant plane moving bearing according to claim 1, characterized in that: One end of the loading shaft (11) is designed with a connecting flange, which can be connected to the driving component; the other end is designed with a thread, which cooperates with the locking nut (18) to achieve pre-tightening of the entire structure.

3. A bidirectional load-bearing compliant plane motion bearing according to claim 1, characterized in that: The bearing end cover (12) is a circular or square structure as a whole, with a through hole provided in the middle for the loading shaft (11) to pass through; a flange is provided at the edge of the bearing end cover (12) for constraining the retaining frame (14).

4. A bidirectional load-bearing compliant plane motion bearing according to claim 1, characterized in that: A through hole is provided in the middle of the retaining frame (14) for the loading shaft (11) to pass through; a plurality of spherical grooves are provided on the retaining frame (14) for installing the balls (13); the balls (13) can rotate freely in the spherical grooves of the retaining frame (14) without falling out, and the balls (13) protrude from the surface of the retaining frame (14) after installation; the retaining frame (14) and the balls (13) are arranged together between the inner ring of the ball joint (15) and the bearing end cover (12), and the balls (13) are in contact with the plane of the inner ring of the ball joint (15) and the plane of the bearing end cover (12) respectively.

5. The bidirectional load-bearing compliant plane motion bearing according to claim 1, characterized in that: The two ends of the ball joint inner ring (15) are planes, forming a ball and plane pair with the ball (13); the outer surface of the ball joint inner ring (15) is a convex spherical surface, forming a spherical pair with the ball joint outer ring (16); a through hole is provided in the middle of the ball joint inner ring (15) for the loading shaft (11) to pass through, and the size of the through hole needs to reserve a certain space for the radial movement of the loading shaft (11).

6. A bidirectional load-bearing compliant plane motion bearing according to claim 1, characterized in that: The inner surface of the spherical joint outer ring (16) is a concave spherical surface, which cooperates with the convex spherical surface of the spherical joint inner ring (15) to form a spherical surface pair; the side of the spherical joint outer ring (16) is designed with a connecting flange, which can be connected to other components.

7. A centrifuge vibration table, characterized in that: It comprises the bidirectionally load-bearing compliant plane moving bearing (1) as described in claim 1, a horizontal actuator (2), a slide (3), a base (4), an accumulator (5) and a vertical actuator (6); the horizontal actuator (2) comprises a cylinder (22) and a piston rod (21), the cylinder (22) is connected to the base (4), and the piston rod (21) is connected to the slide (3) through the bidirectionally load-bearing compliant plane moving bearing (1); the vertical actuator (6) comprises a vertical actuator cylinder (62) and a vertical actuator piston rod (61), the vertical actuator cylinder (62) is connected to the base (4), and the vertical actuator piston rod (61) is connected to the slide (3) through the bidirectionally load-bearing compliant plane moving bearing (1); the accumulator (5) is fixed on the base (4) to supply oil to the horizontal actuator (2) and the vertical actuator (6).

Images